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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

City of Beloit

Chloromethane is an industrial solvent, aerosol propellant and a refrigerant. It also forms as a byproduct of water disinfection. The EPA classifies chloromethane as possibly carcinogenic to humans.

MORE ABOUT THIS CONTAMINANT

 

42

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND120ND
2014ND100ND
2015ND60ND
2016ND30ND
2017ND70ND
2018ND20ND
2019ND20ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 2.69 ppb

The EWG Health Guideline of 2.69 ppb for chloromethane was defined by the Environmental Protection Agency as a benchmark for testing under the Unregulated Contaminant Monitoring Rule program. This health guideline protects against cancer.

ppb = parts per billion

All test results

Date Lab ID Result
2013-03-11709338-8271ND
2013-03-11709312-8271ND
2013-03-11709310-8271ND
2013-03-11709330-8271ND
2013-03-11709326-8271ND
2013-03-11709336-8271ND
2013-09-16745333-9786ND
2013-09-16745335-9786ND
2013-09-16745327-9786ND
2013-09-16745329-9786ND
2013-09-16745331-9786ND
2013-11-04756576-10228ND
2014-02-12770322ND
2014-02-26772252ND
2014-02-26772259ND
2014-02-26772250ND
2014-02-26772256ND
2014-02-26772270ND
2014-02-26772243ND
2014-04-09779189ND
2014-07-17803882ND
2014-10-20826411ND
2015-02-18844273ND
2015-02-18844274ND
2015-02-18844275ND
2015-04-29857820ND
2015-07-08869710ND
2015-10-14889091ND
2016-02-10905181ND
2016-02-10905182ND
2016-02-10905180ND
2017-02-28975355ND
2017-02-28975341ND
2017-02-28975347ND
2017-02-28975334ND
2017-02-28975337ND
2017-02-28975351ND
2017-02-28975344ND
2018-03-071044054ND
2018-03-071044056ND
2019-06-261130747ND
2019-06-261130749ND